move initialization of OptionInt/Double parameters to constructor (#1364)

move initialization of OptionInt/Double parameters to constructor (#1364)

* move init of OptionInt/Double parms to ctor

except for id, which isn't known by formats/filters.
Also, move validation of OptionInt/Double strings to Option
class, where it can be maintained in parallel with the conversion
routines.

* init Option id in init_vec, init_filter_vec.

also
fix -Wclazy-unused-non-trivial-variable.
add test of Option error detection.